NCERT Activity - Two scalene triangles - Quadrilaterals
Question: Make two scalene triangles with sides 6 cm, 9 cm, and 12 cm. Join equal sides in all sensible ways. Draw and classify each resulting quadrilateral.
Answer: Several results are possible. Each must be classified from the exposed side order and verified parallelism; appearance alone is insufficient.
Full step-by-step NCERT solution with diagrams on Something by Zero.